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The ''Oberon'' class was a ship class of 27 British-designed submarines operated by five different nations. They were designed as a direct follow-on from the ''Porpoise''-class: physical dimensions were the same, but stronger materials were used in hull construction, and updated equipment was fitted. The submarines were built between 1957 and 1978 by four shipyards: Cammel Laird (4), Chatham Dockyard (6), Scotts Shipbuilding and Engineering Company (11) and Vickers-Armstrongs (6). Thirteen of the submarines were operated by the Royal Navy, six by the Royal Australian Navy, three by the Brazilian Navy, three by the Royal Canadian Navy/Canadian Forces Maritime Command (plus two ex-Royal Navy boats later acquired for non-commissioned roles), and two by the Chilean Navy.〔 The ''Oberon''s operated during the height of the Cold War, with duties including surveillance, tracking of other ships and submarines, delivery and retrieval of special forces personnel, and serving as targets for anti-submarine training. Submarines of the class were in service until 2000. As of 2015, eight of the submarines are preserved intact as museum vessels, another three are partially preserved (with some exterior portions of the submarine on display), and one is in private ownership and awaiting conversion for display. The rest have been sold for scrap, including one former museum vessel. ==Design and construction== The -long ''Oberon'' class was based heavily on the preceding ''Porpoise'' class of submarines,〔 which were in service from 1956 to 1988. Changes from the ''Porpoise'' design were primarily to improve the strength and stealth of the submarine.〔 Instead of UXW steel, the hull was built from QT28 steel, which was easier to fabricate and stronger, allowing the submarine to dive deeper.〔Brown & Moore, ''Rebuilding the Royal Navy'', p. 116〕 Glass-reinforced plastic was used in construction of the casing. Electronics, sonar, and radar systems were also upgraded to the latest standard. The submarines were equipped with a type 1002 surface search and navigation radar, a type 187 active-passive attack sonar, and a type 2007 long-range passive sonar.〔 The ''Oberon''s were constructed at a variety of shipyards in the United Kingdom: the six Australian and two Chilean submarines by Scotts Shipbuilding and Engineering Company (the latter were built after the Scott Lithgow merger); the three Brazilian submarines by Vickers-Armstrongs; and the three Canadian submarines at Chatham Dockyard.〔 Construction of the British submarines was shared amongst four dockyards: the three mentioned above and Cammell Laird.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oberon-class submarine」の詳細全文を読む スポンサード リンク
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